The standard CD V-700 measures gamma radiation up to 50 milliroentgens per hour over three scales. It uses a Geiger-Mueller tube to detect moderate and high energy beta radiation, and gamma radiation down to low energies. The probe operates at 900 volts which is essentially the center of a plateau extending from about 850 volts to 920 volts. The probe has a beta shield that can twist to open or close. The Geiger Mueller tubes are halogen quenched, and mounted in a probe connected to a 36" cable. Instrument accuracy on any of its three ranges is within ± 10% of the true dose rate from Cobalt 60 gamma radiation. This accuracy is maintained throughout a temperature range of -20 F to +125 F, and at altitudes from sea level to 25,000 feet. The CD V-700 series of radiological survey meters use a meter for visual indication and a 4000 ohm headset for audible detection of activity. Battery life is 100 hours of continuous use. This is based on the carbon/zinc batteries of the early 1960's, newer alkaline batteries should do much better.

E-N has four cells, but they are series parallel. Only 3 volts, but twice the life? Curious because parallel dry cells tend to discharge one another. Three transistors in a very similar circuit to the Lionel, with a major except that there is no HV regulator tube. Instead a Zener in the primary prvides regulation.

Ranges: 0.5, 5, 50 mR/h
Batteries: 4 D cells
Accessories: carrying strap, headset, manual, calibration source.

Government cost in 1969: $19.25
Government Procurement (all 700 Models) - Fiscal Year 1955 - 1985 452,558